A main metallic copper ore minerals pyrite, chalcopyrite and molybdenite. Secondary metallic minerals are chalcocite, covellite, angle silver ore, gold silver and the like. The main non-metallic minerals are sericite, quartz and so on. The useful mineral inlays in the ore are finer in size, and the chalcopyrite, pyrite, and chalcopyrite are closely symbiotic, and the fine particles are unevenly embedded. As far as the natural type of ore is concerned, it belongs to the original sulfide ore, the oxidation rate is 4% to 5%, and the muddy water content is not high. The main useful mineral content ratio in ore is: pyrite: chalcopyrite: molybdenite = 320:45:1 The plant adopts stage grinding and floating process, which respectively obtain copper concentrate, lead concentrate and sulfur concentrate. Products, precious metals such as gold and silver are mainly concentrated in copper concentrates. The principle of grinding and floating principle of the factory is shown in Figure 1.
Figure 1 A porphyry copper ore sorting process a-concentration (slightly); b - third-stage grinding and re-selection (slightly) mixed flotation - one coarse and one fine two sweep; copper and molybdenum separated from sulfur - a thick Two fine two sweeps; float molybdenum and copper - one coarse and three fine sweeps; the obtained molybdenum concentrate is re-grinded and selected four times, and the selected tailings are concentrated back to III grinding.
| Selection indicator | Raw ore grade /% | Concentrate grade /% | Recovery rate/% |
| Molybdenum copper sulfur | 0.01 0.45~0.53 2.0 | ≥45 ≥25 35 | 60~70 ≥85.5 45 |
Recovering a small amount of associated molybdenum ore, the process conditions are more complicated. After years of experimentation, the main experience obtained is: (1) Using a selective Z-200 agent instead of butyl ammonium black drug as the second stage of copper and molybdenum The sulfur separation collector greatly improves the recovery rate of molybdenum (10%~40%), reduces the amount of lime and collector, shortens the flotation time, reduces the number of flotation tanks, and saves energy. The economic benefits are significant. (2) Mixed flotation cycle. When using the return water of the plant, the ether alcohol is used as the foaming agent, which is higher than the oil index No. 2, but the opposite is true when using the water. Therefore, on-site mixed flotation is mixed with No. 2 oil and ether alcohol to obtain a better mixed flotation index. (3) Concentrate and remove the drug before the separation of the concentrate, and add the bleaching powder to accelerate the oxidation and desorption of the collector. (4) Molybdenum and copper separation The molybdenum concentrate is re-grinded and re-selected, and the process of adding sodium sulfide and water glass in stages can obtain qualified molybdenum concentrate and copper concentrate. The recovery rate of molybdenum is also greatly improved. (5) The mixed flotation cycle adopts a new process of branch flow flotation, which improves the grade and recovery rate of the mixed concentrate and reduces the consumption of the collector and the foaming agent.
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